<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="static/css/bootstrap.min.css">
</head>

<body>
    <!-- 给一个容器 -->
    <div class="container">
        <div class="row text-center">
            <h1>学生信息管理系统</h1>
            <hr>

            <a href="" class="btn btn-success">首页</a>
            <a href="" class="btn btn-warning">添加</a>

            <br>
            <br>
        </div>

        <!-- col-md-8 中等屏幕的8  12 -->
        <form onsubmit="return false" action="" method="post" role="form" class="col-md-5">

            <div class="row">
                <div class="form-group col-md-5">
                    <label for="name">姓名</label>
                    <input type="text" name="name" id="name" class="form-control">
                </div>
            </div>

            <div class="row">
                <div class="form-group col-md-5">
                    <label for="sex">性别</label>
                    <input type="text" name="sex" id="sex" class="form-control">
                </div>
            </div>

            <div class="row">
                <div class="form-group col-md-5">
                    <label for="age">年龄</label>
                    <input type="text" name="age" id="age" class="form-control">
                </div>
            </div>

            <div class="row">
                <div class="form-group col-md-5">
                    <label for="age">qq邮箱</label>
                    <input type="text" name="qq" id="qq" class="form-control">
                    <span id="tip"></span>
                </div>
            </div>

            <div class="row">

                <div class="text-center col-md-5">
                    <button type="submit" class="btn btn-success" id="btn">提交</button>
                    <button type="reset" class="btn btn-danger">重置</button>
                </div>
            </div>
        </form>

    </div>

    <script>
        let btn = document.querySelector('#btn')
        btn = onclick = () => {
            let xhr = new XMLHttpRequest();
            let qq = document.querySelector('#qq').value;
            xhr.open("get", `/add?qq=${qq}`, true);
            xhr.send();
            xhr.onreadystatechange = function () {
                if (xhr.readyState == 4 && xhr.status == 200) {
                    let tip = document.querySelector('#tip')
                    tip.innerHTML = xhr.response
                } else {
                    console.log('查询失败');
                }
            }
        }
    </script>
</body>

</html>